1971 Australian Open

{{Use Australian English|date=March 2024}}

{{Use dmy dates|date=April 2022}}

{{TennisEventInfo|1971|Australian Open|

| date = 7–14 March 1971

| edition = 59th

| category=Grand Slam (ITF) / (WCT)

| location=Sydney, Australia

| venue=White City Tennis Club

| surface=Grass / Outdoor

| champms = {{Flagicon|AUS}} Ken Rosewall

| champws = {{Flagicon|AUS}} Margaret Court

| champmd = {{Flagicon|AUS}} John Newcombe / {{Flagicon|AUS}} Tony Roche

| champwd = {{Flagicon|AUS}} Evonne Goolagong / {{Flagicon|AUS}} Margaret Court

}}

The 1971 Australian Open, also known under its sponsored name Dunlop Australian Open, was a tennis tournament played on outdoor grass courts at the White City Stadium in Sydney, New South Wales, Australia from 7 to 14 March. The tournament was originally scheduled to be played in Melbourne but was moved to Sydney on account of a $125,000 sponsorship deal with Dunlop. The tournament date was moved from its regular January slot to March to accommodate scheduling requirements made by the commercial promoters World Championship Tennis and National Tennis League.{{cite news |url=http://nla.gov.au/nla.news-article107918077 |title=Dunlop offers $125,000 for tennis open. |newspaper=The Canberra Times |date=7 April 1970 |page=20 |via=National Library of Australia}} It was the 59th edition of the Australian Open, the 17th and final one held in Sydney, and the first Grand Slam tournament of the year. The tournament was part of the 1971 World Championship Tennis circuit.{{cite book|title=World of Tennis '72|year=1972|publisher=Queen Anne Press|location=London|isbn=9780362001037|oclc=86035663|pages=73–79, 149|editor=John Barrett}} The singles titles were won by Australians Ken Rosewall and Margaret Court.{{cite news |url=http://nla.gov.au/nla.news-article110342960 |title=Australians take the titles. |newspaper=The Canberra Times |date=15 March 1971 |page=12 |via=National Library of Australia}}{{cite news|title=Rosewall Beats Ashe for Aussie Title|url=https://select.nytimes.com/gst/abstract.html?res=FB0C1EF73454127B93C7A81788D85F458785F9|newspaper=The New York Times|date=March 14, 1971}} The tiebreak was introduced for all sets except the deciding set.

The competition for mixed doubles was not held from 1970 to 1986.